Re: Glow int he dark axies
No, it is not true. There are not any naturally bioluminescent caudates. (That I know of...)
You are probably referring to GFP (Green Florescent Protein) axolotls, the result of gene splicing of axolotls with a jellyfish (or was it coral?) protein for florescence. These do not glow either, unless exposed to a blacklight. Leucistic and albino axolotls of this type sometimes appear to be a light greenish yellow under normal light. (This genetic modification has been done in various forms with various species all the way up into primates.)
There is quite a bit about them on the forums here. You can read more on this by plugging "GFP" into the search function.